Effects of Dietary Inorganic Nitrate Supplementation on Exercise Performance in Heart Failure

All participants will consume 210mL of inorganic beetroot juice per day: -Two 70mL bottles of inorganic beetroot juice -One 70mL bottle of sport inorganic beetroot juice) Beetroot juice is sourced from :BEET IT shot, James White Drinks, Ipswich, UK Participants will consume the the sport shot in the morning, and one of each of the other two bottles midday and at night. The sport shot contains approximately 6.4mmol of nitrate and each organic shot contains approximately 4.8mmol of nitrate per bottle, with a total daily dosing of 16mmol nitrate. Participants will be required to have at least 7 days of supplementation with the beetroot juice, but depending on subject availability, the total days dosing could vary between subjects. One subject might have availability to complete all round 1 testing visits within a week, whereas another subject could require a week and a half to complete all visits. Previous research does not indicate any further benefits of nitrate dosing beyond 6 days, so we do not expect the total days dosing to affect the study outcome providing all subjects meet the minimum of 7 days supplementation. Following supplementation, subjects will undergo a minimum of two week wash-out period. Adherence will be managed by reminder phone calls to subjects during the supplementation period. They will also be asked to keep a record of when they consumed the supplement. and return the empty bottles to the research team.